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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c213f3c2117c5714d35b3d02916119fc1510f7eb5bf36d923c51ce9cf11ab63' 
  AND token = '24/8T9nk8Mu1ULtSY5/mh6ARm7dsfzBGdFWz5YoPtvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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