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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644d5e4e71cbaa21288fd42eb8a2103155b63f45348a227bc6018eeb3fc487ad' 
  AND token = 'sryuHU++41B5WrLQ7G1DI55unBY7Ts/8duN0GaoWeCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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