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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93582d554b929a9688c2c43ccd6946e74eacf24c248c0d2026c3c60e723e3cd' 
  AND token = 'r+PJ5VPRLVfiLmC5+olk2JnRiS8+NF1ftdUjRyKLtZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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