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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c8da487a224a7c5223f4c40bd30bc936104117a5d52f49ae43c5986fec47c5' 
  AND token = 't5b3mXF2dl5HR3y4UBmBKJtI03iyct1ReJJG++odiIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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