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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c163780ec4043cbf5f08bbeee052a62d7fcc12e5862fc133687faeefe01a5d7c' 
  AND token = 'Kds7sZVko9L7sQ3co32ziQFbAJ0s0woUbzz0/GIk+Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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