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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2eb894fd83d5140b6fd4c3991bc5e11e75cec945727c208ad1e40fa92664f1' 
  AND token = 'bO1Beny8LMxfjs5dMSLfK4VcUvYe2B9LfbYxas70R4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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