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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e98a1488fb0fb1628d245063728c74fdecfe3b03750a50f0902d59a1c7c26' 
  AND token = 'u6tcdIReNdY7fcPMa2eC/391eMLtu+1/6qPAaTx5WGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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