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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3bde690e1d8c0fc330c81d28334d41087cecdaf381d8aaab82d528fcafd148b' 
  AND token = 'g+v/R6jhbFN1SyfwdRpRqwwczU7vh+vQ385j1+VSw68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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