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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d83ecbd758238ad9f27b5a61a6a60fbd6ef564637e16b3948f04c6ac235ad1e' 
  AND token = '2aeiSwQblw/UboPSldq4pQt6RKj/yJKaR6kif3WtS70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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