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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419f2faeb84e817928539acfcc0f232e1a07c67f7f07c6e93f01704a396a4e08' 
  AND token = 'p5C/N1pTNrL/ev4tgDCJWabO1H1ZQWUWjPUlzubQhYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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