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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92ba20a42cd21250ad4310b96eb0a96fd202eeb6bc21250c16c366a8579cf32' 
  AND token = 'g6I5SSPRfoSm2tRheEKQm1EH85jOVy7hz32mDWkZYHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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