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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c61da5a2e6196f34ce3746bc20e2e470f5c42399a0481b29e9242e754ea50e' 
  AND token = 'OzWyPsN8kQc8PcqEhYSEpNa+XO68BZZkQaRou6DwExk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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