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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356d8d8e046f3016396c5e163a2ea51f4938f336d4ff487dc105ceeb8423f23a' 
  AND token = 'gjG7SHgLboF3Djvi2EM0AnYRkPfA23QI7z76bp3OD90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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