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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9076b5ae615887ed5f83059a45e257e9ea91d57517df33adafb78ee94992e15' 
  AND token = 'K0LSqd6g059M4a/5VRjn6klSlxghTBOYwdYKcnphHBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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