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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9420516d2a5aa3a98a8d135d46cc4c6e9c5f9564eb2b78eb0294a870c4892481' 
  AND token = 'kdZxXIx6NWxQj0DqX8bwLtudw4DLT1hLl+cDXf5FuTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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