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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa75e4548ebb4c15c46ad9654ccbef7e66dad4c67cfecf5ead6c2298de22ea8' 
  AND token = 'ncroMAx21NH4JUCPK+gFRVKAXmldEzS9z8n9Ch/0exA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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