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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e674033cdc4f971b208dfb35356a60ea0bf5e3e2d68d1cb0dd76c709345708' 
  AND token = '1tKJiOACagrl9j1zw0m8Qsh/biggOc5WOGPFoDMC4ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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