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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a68748cbc98360967493ab607ec20012e287485eb5e14be02e580bcb0d3f3c' 
  AND token = 'EoWtyXjsAyZHd4MMoPvoDpw7HekOCogt0Ygz7+fMe6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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