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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92176e3f7cdfca74c67c4f7f681eda9c77b6a5a0cdace51130a95f95ac373161' 
  AND token = 'afE5H2+a2cdwwdlIk4nCBw5fJTdbAYG68IRc4DdVlbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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