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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca79d49723948f820b36493d98410eb4b79801d82d820d3ce5a39f3ea0ed714' 
  AND token = 'muLMMYa9Myi3f0Lqq+qJtnGlusze3ilALRNUHF/P4UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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