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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3808ce974d614f856cf0de110721693b3438601112b2b601e7933b2af7a6e7' 
  AND token = '46zoYZpXizrtHglABjKfXWdg7gLSBWPGP67XeJQXWZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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