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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079aac5fdca33af41f6b0968b9e2d23381b2dc563a54b0a34ae7199888613b73' 
  AND token = 'UeuaY4SXUjDYTJPLSMEr4Cg62PAaFf08zr7FN+Qkhik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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