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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801cea184761cf5a90bcba878d401407e33001132c744e1661b4b9d954859d31' 
  AND token = 'LBMnJy/2G+K37GErMgXsXBzxH4VrL7NXZHM+yGdFQO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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