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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c0cb325f68c3339c027f637760b08cd8a7c52ab17876bd41597cb64298bdc9' 
  AND token = '6L3tQqPQtEKJBd0T0ffrp8L8A/S4byJrKIbcaP6LJC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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