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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac556075156b76a90bcfbc66340fbb585b5a3c140830ebbcd36deace2139649a' 
  AND token = 'j/6RElLjjNSos70u4vWbwxEuDUEcpOge2RHcufXqCac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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