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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1f1ecd64ac4ff5495a8259d70e6cc8c71336b36974e1b15513b375adf0f482' 
  AND token = 'ZEtxQNI47WtxP1E4PXeASaKo80OM/78sHqREvjvbE8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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