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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718fa516bdfe46c96d24b8b2e53b8c0db4425d9f5f5b5c48413aa1f696e8b04d' 
  AND token = 'ahE20aaXOISXY+2iBrLtRDJptPr9LeBrobt3qTh0C5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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