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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549079e275ddb30df9cf76b013676e467f93a0f484b54f40244267a37e61f243' 
  AND token = 'lDl+HcZlkFkyo57XRXEqPb9fbozkA4RXkWwX1XssnzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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