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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76da9dd68b419bcdced2a5929a7a3720fdf9f43aa7bf82498a74ad9844c5c116' 
  AND token = 'em5dnq+Ko4EPcXqnctPF5TwFxvc1iyJ3N7BDkYW+4Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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