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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c88af62cc1254891cfbf977a8586dca856cb750e76bd334dcc2512ada43bbd6' 
  AND token = 'tEVINCzZV19tpyenQ5Ku9VMhPtroK/3Nvw2mFui4uhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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