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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4897e3730c6e37c1e8cda36066f9e4b19d286e605f2dae92417ad7094c9918a' 
  AND token = '437GVWWcmNQcNj2dDe0qU5KYQW8pTxjguA0W3FGG6q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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