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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9b5e81b0f2c6bc8597e5e2d7a75f0433bd419eb5704bc5fc4d0384c3550ba0' 
  AND token = '67Byqw1BHAnRHoYv4CVDZL4DvczyS4NPygm7BQ/PJW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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