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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f808bb0e2edb8db548ee9b69df5b72bce80d44608939268e811bb0fbdc30735' 
  AND token = 'sA9vLbJUJfjOkus/sX9plq+Jof1XORT5GH9SURy91fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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