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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91de91b8f1ff50035ba327300f34d3a44003d5a44c732ca3b753bb30d5744308' 
  AND token = 'ZhMXdU6KPx56Nd/4G4h207nAFFtdRQzcdQFKuJFLR/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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