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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be4d1e9fcb1bd5d488d1997530db53f23506b3dad58cf63cd6d52099a740953' 
  AND token = 'gkGf10+f8raUgDI/XX/lxI4+ACxalsVcYLqtBLntREE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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