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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc8bcbd04f39b221d684caf4f286887ccec7ff465456e0363495504936eb699' 
  AND token = 'LWhm9tTqX/UvRZ2iz9PiXz07bha9t1DXzuOVZX8I+Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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