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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d5183d08ec37f115e998d1a19fa672e57520ae32d0bae3d3a8d50812d43b43' 
  AND token = 'MDCoDer6BBKrNSKJhXZ2wFSnY33S6Sn5pYXbtcfswgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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