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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e95c7ad8e7a00aeac86c96cb9e9ec8e5aa62bb17c7e01ff6951a759ae1cdf30' 
  AND token = '7LJcDEz1kWG0G2X7dTV08xx5TXtMbzvk+Gnft7exCIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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