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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9381c8b99c2869828a402ee88691c76543cd56fc8463b24fd0b8852b1a1f16a0' 
  AND token = 'brc/NVw+6gtQfhOr9xVz9/ocvaeDnFBlQtvAZLDm0CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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