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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4d4b4cd5a2befd7adae91658aa3093929ff9ad04c9b08cb332eeffd6394011' 
  AND token = 'Zkw81qITby0fVPzZUWMDHz0Kq4yF7exrWxfAAoeygGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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