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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a44ec54efe9a2993b2a90fc8160db548453afa59da8b6965e4db0dd539611a' 
  AND token = 'X9neo03m1U8MwzJXTJPIv62mGgVi7lSq1SNVMCkOmQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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