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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4183af3534efd84fe6111d70b7322fce436504833b14ab46161c0498e3bea8d9' 
  AND token = 'jfRLMR4RYZ9SRQJclKSkZVx17nrzxscJFj8NktioAVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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