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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fec2fcd9fee76b2f67df683ff731cd58676f10b5e11a0a0291c9fa5dc0f8cc' 
  AND token = 'ChiUTLzTiJ8E/Hxy4AGUGT/RmRGvhWahTTJp+BHuBxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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