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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9113522b26844319112f9ed7787a2681f7095ef6f84ebce421a6097fe7f04cf1' 
  AND token = '2P1dPLH2Y2lXvI7q43SfrW6pZUnRaD80wmhe+pWcibA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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