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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9931191f579b703109838374a8788ba92884f843c9e980a6a54bfab4ea95f00c' 
  AND token = '/LVK8k5YjNxusmEqvE4ORU9sZyceww8ydguxPWpB/ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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