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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd294c41906c6cb970fa21ae0d7f091cdedea4c391ffb3d0930fb9e691886c1da' 
  AND token = '7Q/QL1K2lmW2+x2p+7Wt3JNDJE6QEeQVX482nZlXTaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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