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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab5cf01bd5fdc02d2422a63056434ae742024240ab75377d647e52ea9095f06' 
  AND token = 'bB2c1L1LmnNKK2IQUSaNY3ff/GSwQcgB0peM4O7aHNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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