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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8036b8f6924d6c4da1ba62229b2a4c6102c312663bc9c9df6e12c6b563a3ba' 
  AND token = '3KR/fFKSiIXWJ2F0ke2im18Lahgf/aUCYlcEAPLG4aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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