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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f61f140fbb9418d18ad1c073b692fc7d2ab935b0e8d108e025bb0798ce3dfc6' 
  AND token = 'fHlYpyRGe+rJfa+HE51iMJrhCZUhjGAva3vGOg8bX6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}