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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91351bb9360c04c401204250208f34d66e6a1f4e53410e70090ef47b37e721b' 
  AND token = 'U2iZcQr/AjCIQfT/MyI6xpgHAEneq6x5NL8xcdYK5Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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