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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09c983205c789949b129974631e9a818bcd93ed15d28c70b2f17fb4753c8c58' 
  AND token = 'CjrBJQNAjLxTA+vSQE0y6OR5lD/lis1BbSG9AxVMBu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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