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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485506853a76fef0e5d9d61991ca72d4390491589b51c66ed424943ecbd31798' 
  AND token = 'W6ZLHTCkJHkfBDp0Ax0vco06gJXKX4b4V2Rqvq2c6L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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