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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b04989520fd6110e0298aa5344825d3c4261380c5cdd703a4b45156e73d3e40' 
  AND token = 'dWRn9PdxP18OQM9uMPsY5aN7pcgJdrOZGosHMUkc6/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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