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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193a5c36cafae34e2bdefa809e01fb60665d401f99e5e067af12cd826759abbf' 
  AND token = 'pgg9v+rof990XBW6HQ3cPHCGliBwhe8eDbOlb5Ia/Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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