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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cd013bf788f98e625c6c9b0113652613c5575c168a74d6ac1d282f12ff64fc' 
  AND token = '4ZWuDQkpxV/ioGwgjj44zG6T3o0m2r+20W4UcGakDCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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