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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7e4554528a22e557639a9ec2380dc4e4db72ef2a09be4429956e32023eb43a' 
  AND token = 'ZBdi7gO1kqr3ljI87ZeffcCEh6VI4Uo5j9oQCZ+B0JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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