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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ce3a1dd166599b19222d77359b364f170960b6f30c5e021f50beb0a1cef66c' 
  AND token = 'TIIEM04ClmRF1ro3ehZ3HaYq5ammSrJrxlRUOs3vL4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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