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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2596ed273c0d43182f825c89c40793634c94b54393e54b6d7451d07a79a17caf' 
  AND token = 'JaBjS98gCpvpMo40iDbxO9cbeKVAlIoDEfPb2EB/jJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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