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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a450451a0169b448876fe64345e8e193c1673555daff3faa33b2d83a6582ca86' 
  AND token = '9rpHGrir+zA9mr9K2RGi7YtPUNG1ytQUTMBuCjflbIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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