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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86a2077887612fb4c5939d1290bf29a04a60c840853b38c28e704507aa04e42' 
  AND token = 'eqUIJSsq8DCPvIwORk8P+Bk367qk0qeIv3SJGrS21pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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